quantum unit test doesn't pass with openvswtich or linuxbridge plugin

The patch is uploaded at
https://review.openstack.org/#change,4402

Reviewed: https://review.openstack.org/4402
Committed: http://github.com/openstack/quantum/commit/a945d1a30478c644d307c77a8a85f3a08e5a834e
Submitter: Jenkins
Branch: master

commit a945d1a30478c644d307c77a8a85f3a08e5a834e
Author: Isaku Yamahata <email address hidden>
Date: Thu Feb 23 01:55:30 2012 +0900

    unittests: setup FLAGS.state_path properly: bug 938637

    This patch fixes bug 938637
    Quantum unittests doesn't pass with plugin (openvswitch, linuxbridge) in venv
    as follows.
    This is because config file under <quantum src>/etc/ can't be find due to
    FLAGS.state_path points to <python-quantumclient src> which can be different
    from <quantum src>.
    Set FLAGS.state_path to <quantum src> when quantum unit tests.

     $ PLUGIN_DIR=quantum/plugins/openvswitch ./run_tests.sh -V
    <snip>
    ActionExtensionTest
        test_extended_action_for_adding_extra_data (quantum.tests.unit.test_extensions.ActionExtensionTest)ERROR
    <snip>
    ======================================================================
    ERROR: test_extended_action_for_adding_extra_data (quantum.tests.unit.test_extensions.ActionExtensionTest)
    ----------------------------------------------------------------------
    Traceback (most recent call last):
      File "/quantum/tests/unit/test_extensions.py", line 212, in setUp
        self.extension_app = setup_extensions_test_app()
      File "/quantum-src/quantum/tests/unit/test_extensions.py", line 474, in setup_extensions_test_app
        return TestApp(setup_extensions_middleware(extension_manager))
      File "/quantum-src/quantum/tests/unit/test_extensions.py", line 469, in setup_extensions_middleware
        conf, app = config.load_paste_app('extensions_test_app', options, None)
      File "/quantum-src/.venv/src/python-quantumclient/quantum/common/config.py", line 316, in load_paste_app
        conf_file, conf = load_paste_config(app_name, options, args)
      File "/quantum-src/.venv/src/python-quantumclient/quantum/common/config.py", line 286, in load_paste_config
        "Cannot load application %s" % app_name)
    RuntimeError: Unable to locate any configuration file. Cannot load application extensions_test_app
    -------------------- >> begin captured logging << --------------------
    quantum.extensions.extensions: INFO: Initializing extension manager.
    quantum.extensions.extensions: INFO: Loading extension file: foxinsocks.py
    quantum.extensions.extensions: DEBUG: Ext name: Fox In Socks
    quantum.extensions.extensions: DEBUG: Ext alias: FOXNSOX
    quantum.extensions.extensions: DEBUG: Ext description: The Fox In Socks Extension
    quantum.extensions.extensions: DEBUG: Ext namespace: http://www.fox.in.socks/api/ext/pie/v1.0
    quantum.extensions.extensions: DEBUG: Ext updated: 2011-01-22T13:25:27-06:00
    quantum.extensions.extensions: WARNING: Loaded extension: FOXNSOX
    quantum.extensions.extensions: INFO: Loading extension file: __init__.py
    quantum.extensions.extensions: INFO: Loading extension file: foxinsocks.pyc
    quantum.extensions.extensions: INFO: Loading extension file: __init__.pyc
    --------------------- >> end captured logging << --...